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The Shimano Di2 Junction B box is the center of the e-tube Di2 system
So you have the advantages of a shallower rim
Function and comfort is top notch
SAFETY RIDGE
Shimano's "A junctions" such as the EWRS910 are used to connect E-tube cables coming from Di2 shifters to the down tube E-tube wiring
Craft Men's Adv Essence Hydro Jacket Bike-Tools & Maintenance-Lube & Grease The Shimano Di2 Junction BJacket for intense training, running and similar activities in bad weather conditions. Made of breathable and waterproof 3 layer recycled fabric with taped critical seams. Adjustable hood with visor and reflective details. Regular fit Ventair wind & water proof 3L laminated fabric (WP 10,000 MVP 10,000) Critical seams are taped Adjustable hood with visor to protect from rain Two zip side pockets
